SU148567A1 - Instrument for measuring the friction force of the pulp against the walls of the pipeline - Google Patents

Description

Instruments for measuring the friction force of a fluid against the walls of a pipeline are known. In particular, devices are known in which the measuring section of the pipeline is connected to the main pipeline by elastic elements.

The force of movement of the measuring section of the pipeline in them is measured mechanically - lever weights. The disadvantage of such devices is that they can measure only very small values of the deformation of the pipeline walls caused by frictional force. To measure significant deformations from internal pressure, special amplifiers have to be used and a correction factor for the pressure in the pipeline must be taken into account.

In the proposed device, in order to increase the measurement accuracy by compensating for the initial weight of the measuring section of the pipeline, the latter is sealed with a float floating on mercury poured into the pocket of the instrument casing, and the inductive converter core is rigidly connected to the float.

The frictional force is determined by the strength of the current in the winding of the compensating electromagnet, which returns the measuring section of the pipeline to a neutral position relative to the deformation of the elastic elements.

The drawing shows schematically the proposed device in axial section.

The measuring section of the pipeline 1 is placed between two elastic suspensions 2, which are elastic rings of such thickness, at which they ensure the free movement of the measuring section of the pipeline 1 within the required limits. Elastic suspension stacked in the undercut of the tube-glass 3 and slightly compressed. Item 148567-2flow 4, floating in mercury, poured into the karma and discharge casing 5, rigidly fastened to the pipeline /. On the float there are two force compensation units 6. The lift force of the float 4 compensates for the initial weight of the measuring section of the pipeline. When the core 7 of the differential transformer sensor 8 is in the middle position, the voltage at the output of the sensor is zero. When the core 7 is displaced, a voltage arriving at the input of a phase-sensitive electronic amplifier appears at the output of the transformer sensor 8.

A reversible motor is turned on at the amplifier output, which moves the rheostat slider until the current in the winding of the compensating electromagnet 9 increases and no core 10 is present (the electronic amplifier, reversible motor, and rheostat are not shown in the drawing). The core 10 through the rod // returns the measuring section of the pipeline / to its original position. When the friction force decreases, the process is repeated in the reverse order.

Subject invention

Instrument for measuring the friction force of the pulp against the pipeline wall, containing a sensitive element made in the form of a segment of a vertical main pipeline connected to it in one line by elastic suspensions, an inductive converter and a compensation differential transformer of a converter with an electromagnetic compensation system u and in order to increase the measurement accuracy by compensating for the initial weight of the measuring section of the pipeline, the latter is sealed with a float, ayuschim a mercury filled pocket in the instrument casing, and the core of the inductive transducer is rigidly connected with the float.

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